Question About A Product!!

[girlswin2]

I am thinking about getting rid of my home phone except for internet purposes.  Does anyone use the magic jack (I think thats what it is called) that plugs into your computer.  Does it work like they say and do you like it better?    

Am I allowed to ask questions like this b/c I think I saw it on this site so I was going to click it and get it is someone could let me know if it works like its said to and if so is there any hidden costs.